mer-[RuCl3(P–P)H2O] (P–P = dppb or diop) as a starting material for the synthesis of binuclear complexes. Crystallographic structures of [(dppb)ClRu–μ(Cl)3–RuCl(dppb)] and [(η6-C6H6)Ru–μ(Cl)3–RuCl(dppb)].: Imine hydrogenation using mono- and binuclear ruthenium complexes